rs5c62 RICOH Co.,Ltd., rs5c62 Datasheet - Page 23

• Manufacturer Part Number: rs5c62
• Description: Real-time Clock
• Manufacturer: RICOH Co.,Ltd.

3. Configuration of Oscillatory Circuit
of the oscillatory capacitors C
In the oscillatory circuit, which is driven by a constant voltage of about 2V relative to the VDD pin, either one end
When either one end of the oscillatory capacitors C
pin, the oscillatory circuit is still operational but subject directly to fluctuations in the voltage of the system
power supply. Under sharp fluctuations between 5V and battery voltage in particular, the oscillatory circuit
may be brought to a temporary stop. Thus, it is not recommendable to connect either one end of the oscilla-
tory capacitors C
1) Install the oscillatory capacitors C
2) Avoid laying any signal or power line in the proximity of the oscillatory circuit (particularly in the area
3) Apply the highest possible insulation resistance between the OSCIN or OSCOUT pin and the printed cir-
4) Avoid using any long parallel line to wire the OSCIN and OSCOUT pin.
5) Take extreme care not to cause condensation, which leads to various problems such as failure of the crys-
1) When applying an external input of clock pulses (32.768kHz) to the OSCIN pin:
2) Avoid using the oscillator output of the RP/RF/RS5C62 (from the OSCOUT pin) to drive any other IC for
RP/RF/RS5C62
R
cuit board (PCB).
tal oscillators.
DC coupling ........... Prohibited due to mismatching input levels.
AC coupling ........... Permissible except that unpredictable results may occur upon detection of the stop of
oscillation if any error occurs in such detection due to such factors as noises. Timer operation is prohibit-
ed upon detection of the stop of oscillation.
the purpose of ensuring stable oscillation characteristics.
marked with “¬A®” in the above figure).
F
R
D
G
and C
< Considerations in Installing Components Surrounding Oscillatory Circuit >
D
VDD
OSCOUT
OSCIN
G
to the VSS pin.
and C
D
A
must be connected to the VDD pin without exception.
32kHz
G
< Other Relevant Considerations >
and C
C
C
D
G
D
in the closest possible proximity to the IC.
VDD
G
Reference
and C
D
is connected to the VSS pin instead of the VDD
Typical external components:
Standard values of internal elements:
X'tal : 32.768 kHz
C
C
R
R
G
D
F
D
=12M½
=5pF to 35pF
=60k½
=5pF to 35pF
R
1
² 35k½
RP/RF/RS5C62
19